- Remove bidirectional $effect sync in RawAppSidebar; bind FileExplorer
directly to files prop with {} default
- Avoid creating new files object on every keystroke in FilesetEditor;
merge editContent → args in a single effect without intermediate spread
- Simplify no-op `?? undefined` in addResourceType
- Add backend validation: reject create_resource_type when both
is_fileset and format_extension are set
- Fix fileset alert title showing undefined format extension
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>